Buggy code:
private static final String COMMAND_LINE_ARGUMENTS = "command_line" ; private static final String COMPILER = "compiler" ; private static final String COMPILER_COPYRIGHT = "copyright" ; private static final String COMPILER_VERSION = "version" ; private static final String COMPILER_NAME = "name" ; private static final String EXCEPTION = "exception" ; private static final String ERROR = "ERROR" ; private static final String ERROR_TAG = "error" ; private static final String KEY = "key" ; private static final String MESSAGE = "message" ; private static final String NUMBER_OF_CLASSFILES = "number_of_classfiles" ; private static final String NUMBER_OF_ERRORS = "errors" ; private static final String NUMBER_OF_LINES = "number_of_lines" ; private static final String NUMBER_OF_PROBLEMS = "problems" ; private static final String NUMBER_OF_TASKS = "tasks" ; private static final String NUMBER_OF_WARNINGS = "warnings" ; private static final String OPTION = "option" ; private static final String OPTIONS = "options" ; private static final String PATH = "path" ; private static final String PROBLEM_ARGUMENT = "argument" ; private static final String PROBLEM_ARGUMENT_VALUE = "value" ; private static final String PROBLEM_ARGUMENTS = "arguments" ; private static final String PROBLEM_ID = "id" ; private static final String PROBLEM_LINE = "line" ; private static final String PROBLEM_MESSAGE = "message" ; private static final String PROBLEM_SEVERITY = "severity" ; private static final String PROBLEM_SOURCE_START = "charStart" ; private static final String PROBLEM_SOURCE_END = "charEnd" ; private static final String PROBLEM_SUMMARY = "problem_summary" ; private static final String PROBLEM_TAG = "problem" ; private static final String PROBLEMS = "problems" ; private static final String SOURCE = "source" ; private static final String SOURCE_CONTEXT = "source_context" ; private static final String SOURCE_END = "sourceEnd" ; private static final String SOURCE_START = "sourceStart" ; private static final String SOURCES = "sources" ; private static final String STATS = "stats" ; private static final String TASK = "task" ; private static final String TASKS = "tasks" ; private static final String TIME = "time" ; private static final String VALUE = "value" ; private static final String WARNING = "WARNING" ; private static final String XML_HEADER = "<?xml<seq2seq4repair_space>version=\"1.0\"<seq2seq4repair_space>encoding=\"UTF-8\"?>" ; private static final String XML_DTD_DECLARATION = "<!DOCTYPE<seq2seq4repair_space>compiler<seq2seq4repair_space>SYSTEM<seq2seq4repair_space>\"compiler.dtd\">" ; private static final HashMap FIELD_TABLE = new HashMap ( ) ; private static void appendEscapedChar ( StringBuffer buffer , char c ) { } private static String getEscaped ( String s ) { } private static String getReplacement ( char c ) { } private PrintWriter err ; boolean isXml ; private PrintWriter log ; private PrintWriter out ; private int tab ; private HashMap parameters ; public Logger ( PrintWriter out , PrintWriter err ) { } public String buildFileName ( String outputPath , String relativeFileName ) { } public void close ( ) { } public void compiling ( ) { } private void endLoggingProblems ( ) { } public void endLoggingSource ( ) { } public void endLoggingSources ( ) { } public void endLoggingTasks ( ) { } public void endTag ( String name ) { } private void extractContext ( IProblem problem , char [ ] unitSource ) { } private String getFieldName ( int id ) { } public void flush ( ) { } public void logAverage ( long [ ] times , long lineCount ) { } public void logClasspath ( FileSystem . Classpath [ ] classpaths ) { if ( classpaths == null ) return ; if ( this . isXml ) { final int length = classpaths . length ; if ( length != 0 ) { this . printTag ( Main . Logger . CLASSPATHS , null , true , false ) ; for ( int i = 0 ; i < length ; i ++ ) { this . parameters . clear ( ) ; <START_BUG> String classpath = classpaths [ i ] . normalizedPath ( ) ; <END_BUG> parameters . put ( Main . Logger . PATH , classpath ) ; File f = new File ( classpath ) ; String id = null ; if ( f . isFile ( ) ) { if ( org . eclipse . jdt . internal . compiler . util . Util . isArchiveFileName ( classpath ) ) { id = Main . Logger . CLASSPATH_JAR ; } else { id = Main . Logger . CLASSPATH_FILE ; } } else if ( f . isDirectory ( ) ) { id = Main . Logger . CLASSPATH_FOLDER ; } if ( id != null ) { this . parameters . put ( Main . Logger . CLASSPATH_ID , id ) ; this . printTag ( Main . Logger . CLASSPATH , parameters , true , true ) ; } } this . endTag ( Main . Logger . CLASSPATHS ) ; } } } public void logClassFile ( boolean generatePackagesStructure , String outputPath , String relativeFileName ) { } public void logCommandLineArguments ( String [ ] commandLineArguments ) { } public void logException ( Exception e ) { } public void logIncorrectClasspath ( String wrongClasspath ) { } public void logNoClassFileCreated ( String fileName ) { } public void logNoClasspath ( ) { } public void logNumberOfClassFilesGenerated ( int exportedClassFilesCounter ) { } public void logOptions ( Map options ) { } private void logProblem ( IProblem problem , int localErrorCount , int globalErrorCount , char [ ] unitSource ) { } public void logProblemsSummary ( int globalProblemsCount , int globalErrorsCount , int globalWarningsCount , int globalTasksCount ) { } public int logProblems ( IProblem [ ] problems , char [ ] unitSource , Main currentMain ) { } public void logProgress ( ) { } public void logRepetition ( int i , int repetitions ) { } public void printStats ( Main main ) { } public void logTiming ( long time , long lineCount ) { } public void logUsage ( String usage ) { } public void logVersion ( ) { } public void logWrongJDK ( ) { } private void logXmlProblem ( IProblem problem , char [ ] unitSource ) { }

Fix:
String classpath = classpaths [ i ] . getPath ( ) ;